[7.2.x-openjdk11] SSO_SECRET parameter should be required if configuring RH-SSO integration

<subsystem xmlns="urn:jboss:domain:keycloak:1.1">
   <realm name="bsig">
      <!-- ##KEYCLOAK_PUBLIC_KEY## -->
      <auth-server-url>https://sso-cicd.192.168.99.100.nip.io/auth</auth-server-url>
      <register-node-at-startup>true</register-node-at-startup>
      <register-node-period>600</register-node-period>
      <ssl-required>external</ssl-required>
      <disable-trust-manager>true</disable-trust-manager>
      <!-- ##KEYCLOAK_TRUSTSTORE## -->
      <allow-any-hostname>false</allow-any-hostname>
   </realm>
   <secure-deployment name="ROOT.war">
      <realm>bsig</realm>
      <resource>root</resource>
      <auth-server-url>https://sso-cicd.192.168.99.100.nip.io/auth</auth-server-url>
      <enable-basic-auth>true</enable-basic-auth>
      <credential name="secret" />
      <enable-cors>false</enable-cors>
      <bearer-only>false</bearer-only>
      <principal-attribute>preferred_username</principal-attribute>
   </secure-deployment>
</subsystem>
<!-- ##KEYCLOAK_SAML_SUBSYSTEM## -->

16:15:58,005 WARN  [org.keycloak.adapters.authentication.ClientIdAndSecretCredentialsProvider] (pool-25-thread-1) Client 'root' doesn't have secret available
16:15:58,013 ERROR [org.keycloak.adapters.NodesRegistrationManagement] (pool-25-thread-1) failed to register node to keycloak
16:15:58,013 ERROR [org.keycloak.adapters.NodesRegistrationManagement] (pool-25-thread-1) status from server: 400
16:15:58,013 ERROR [org.keycloak.adapters.NodesRegistrationManagement] (pool-25-thread-1)    {"error":"unauthorized_client","error_description":"INVALID_CREDENTIALS: Invalid client credentials"}